Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd5816e322151a8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 17:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0624c6d203dd36b31a5a96e6f85bb464 SHA-1: 23ae90586c94aa62bb50e687d202f3c431e924ff SHA-256: 0fd5816e322151a8a82a85f885d252a2aea132a252ce535a8de88d88e2dffa49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct hosts and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=image+file+to+pdf+file+converter+free+download PDF link annotation
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c1acf5f778388ae156a04bd33e3950d2/75589965089.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4f53c357a7e077c2eba2b1b95507755b/litipewurewiju.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/sitewe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/amrrltvc026mleda7fbtjvotct/23886813442.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/638f354f35e156e4e85d30e4264d9f48/16382301535.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b2ea18e8---goxifagilaridirepad.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef52d8d33f---80415468770.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/pebozuzajomipexijikikubi.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab3e9dd3---vujabawarobifatisezagita.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/37186910704.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/832086cf35b35dd9bb839af30ae6df74/zekakibefe.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/tometir.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5882099a---maxofujoxitu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/nozixuluj.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5419499plamu4dnjote882q2k5/8672392969.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/kowit.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fcc8db8a5530d0b8e2f9c57e7f2b6fe/69293820873.pdfIn PDF document text
    • https://kristinanamaste.eu/files/jegovagef.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf30c4d87---rifidukoposegujusomad.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/98945329603.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160724977a949d---20337652706.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/sekik.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/53a23181313b1b8e406ae0f1fdf42c2b/sozadigezeli.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081da49e7077---bogeniwiwakubimijinutukef.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/47912647578.pdfIn PDF document text
    • http://skupka54.ru/upload/m/12373250966.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/28282932715.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607621996a04b---76524713014.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 10896 bytes
SHA-256: d0e9f028107324a7bfee08fd1d6f700e9ea736ad1d2a11cc6a9a647aa18e75bc
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16612 bytes
SHA-256: 63b7c36b4fcc7d8f705763ff954d7ead26d5ed15fdc76c13b5387d657f88921b
font_02_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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